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I read the manual as suggesting the opposite. The starter battery can be fully drained but the service/auxiliary /2nd battery cuts out supply at 11.5v and reconnects at 12.0v. The exception being anything wired directly to the battery rather than via the Smartpass output.I understood that the system allows you to pull energy from both batteries till the main battery reaches a threshold it keeps to make sure all vital functions have enough power, whilst I assume you can fully discharge the second one?